You're looking for the manual for the Sevcon Gen4 Size 8!
The Size 8 is unique in the Gen4 family because it has an internal cooling fan for high-current operation. The manual provides a replacement part number (Sevcon P/N: 726-65011-01) and instructions: sevcon gen4 size 8 manual
The manual explicitly states that if you skip the Static Tune, the Rotating Tune will fail with a “Flux Observer Saturation” fault. You're looking for the manual for the Sevcon Gen4 Size 8
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Never save a parameter file from a Size 6 and load it into a Size 8. The scaling factors for current sensing are different. Doing this will destroy the controller within seconds of throttle application. sevcon gen4 size 8 manual